CVE-2003-1348 in Guestbook
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in guestbook.cgi in ftls.org Guestbook 1.1 allows remote attackers to inject arbitrary web script or HTML via the (1) comment, (2) name, or (3) title field.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2003-1348 represents a classic cross-site scripting flaw in the ftls.org Guestbook 1.1 application's guestbook.cgi script. This security weakness falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as a reflected XSS vulnerability that affects user input fields within the guestbook application. The vulnerability exists due to inadequate input validation and output sanitization mechanisms that fail to properly escape or encode user-supplied data before it is rendered back to other users through web pages.
The technical implementation of this vulnerability occurs when attackers exploit three distinct input fields within the guestbook.cgi script: the comment field, the name field, and the title field. When users submit content through any of these fields, the application processes the input without sufficient sanitization measures, allowing malicious scripts to be embedded within the submitted data. The vulnerability is particularly dangerous because it affects multiple input vectors, increasing the attack surface and providing attackers with several potential entry points to inject malicious payloads.
The operational impact of this vulnerability extends beyond simple data corruption or display manipulation. Attackers can leverage this weakness to execute arbitrary JavaScript code within the context of other users' browsers, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The reflected nature of the XSS means that the malicious script is immediately executed when victims view the affected guestbook entries, making this a highly effective vector for social engineering attacks. This vulnerability undermines the fundamental security principle of input validation and demonstrates poor secure coding practices in the development of web applications.
Mitigation strategies for CVE-2003-1348 should focus on implementing comprehensive input sanitization and output encoding mechanisms. The most effective approach involves applying proper HTML entity encoding to all user-supplied input before rendering it in web pages, ensuring that any potentially malicious script tags or JavaScript code are neutralized. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of protection by restricting the sources from which scripts can be executed. Organizations should also consider implementing input length limits and regular security code reviews to prevent similar vulnerabilities from emerging in future development cycles. This vulnerability aligns with ATT&CK technique T1059.007 for JavaScript execution and T1566 for social engineering through malicious web content, highlighting the broader threat landscape that such vulnerabilities enable.